You can get ~ 2.5% cashback on your tax return payment if you make a payment with Citibank CashReturns card via online payment services such as Pay1040.com and OfficialPayments.com within 3 months after credit card approval. You will be charged ~ 2.5% for making the payment by the payment companies. Since Citibank CashReturns card offers 5% cashback during the first 3 months, your net cashback will be ~2.5%.
